Basic example?

[ikmolbo]

Hi,

I'm trying to use Abaculus to generate a hi-res image. However, I haven't got the hang of the getTile function.

Could you give a simple example that, say, uses tiles from examples.map-zr0njcqy (from the developer docs: http://api.tiles.mapbox.com/v4/examples.map-zr0njcqy/0/0/0.png?access_token=pk.eyJ1Ijoid3JpZ2dsZXIiLCJhIjoiOXBUMjFERSJ9.jo2f0W7fTzbX-7lj_8pk7g) and saves an image to the local disk?

This is as far as I got, and the getTile function (at least) is clearly incorrect.

// Calculate image bounds from center lng,lat coordinates and
// pixel dimensions of final image (will be multipled by scale).
var params = {
zoom: 4,
scale: 4,
center: {
    x: 20,
    y: -10,
    w: 100,
    h: 100
},
//format: {format},
//quality: {quality},
getTile: function(z,x,y, callback){
            // do something
            return 'http://api.tiles.mapbox.com/v4/examples.map-zr0njcqy/' + z + '/' + x + '/' + y + '.png?access_token=pk.eyJ1Ijoid3JpZ2dsZXIiLCJhIjoiOXBUMjFERSJ9.jo2f0W7fTzbX-7lj_8pk7g';
            //return callback(null, buffer, headers);
        },
//limit: {limit}
};

abaculus(params, function(err, image){
   if (err) return err;
   console.log('File saved.');
   // do something with image
});

I know that the Static Maps API exists, but this does not allow images large enough for my purposes.

Many thanks,

[oldo]

I too would love a basic example as I'm having difficulty working out how to get abaculus to work. Cheers :-)

[poussinxt]

I am having the same difficulty building the getTile function! any luck?

[ssured]

var request = require('request');
var abaculus = require('abaculus');

// Calculate image bounds from center lng,lat coordinates and
// pixel dimensions of final image (will be multipled by scale).
var params = {
  zoom: 14,
  scale: 1, // 1=72dpi, 4=288dpi
  center: {
      x: 6.6566667,
      y: 53.216667,
      w: 1000,
      h: 1000
  },
  // format: {format}, // png
  // quality: {quality},
  getTile: function(z,x,y, callback){
    var url = 'http://tile.openstreetmap.org/'+z+'/'+x+'/'+y+'.png';

    request({
      method: 'GET',
      url: url,
      encoding: null
    }, function(err, response, body) {
      if (err) {
        return callback(err);
      }
      console.log('got url', url);
      callback(null, body, response.headers);
    });
  }
  // limit: {limit}
};

abaculus(params, function(err, image, headers){
  if (err) return err;

  require('fs').writeFile('image.png', image, function(err, res) {
    console.log(err ? err : 'success');
  });
});